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What is cross multiplication?
Cross multiplication:
In cross-multiplication, we multiply the numerator of the first fraction with the denominator of the second fraction and the numerator of the second fraction with the denominator of the first fraction .
Suppose you want to add the fractions$\frac{1}{3}+\frac{2}{5}$. To get the numerator of the answer, cross-multiply. In other words, multiply the numerator of each fraction by the denominator of the other:
$1 \times 5 = 5$
$2 \times 3 = 6$
Add the results to get the numerator of the answer:
$5 + 6 = 11$
Multiply the two denominators together to get the denominator of the answer.
To get the denominator, just multiply the denominators of the two fractions:
$3 \times 5 = 15$
The denominator of the answer is 15.
So, answer is $\frac{11}{15}$
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